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post #1 of 9 (permalink) Old 1 Week Ago Thread Starter
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Battery Charging Fault

Morning

I've had car into a local garage who couldn't resolve the issue. I've had a browse through this forum but can't seem to find anything.
I am personally not car smart with faults or repairs, I would have to ask a friend or take a garage for any work required.


Vehicle:
Renault Megane 2011 MK III 1.6 16V
Dynamique Tom Tom
61,000 miles


Problem - My dash is intermittently flashing Battery Charging Fault, ABS light, and STOP.
Video: https://youtu.be/sY_WqNxPWXk


Background-
Car sat for a week in an airport car park while on holiday, when I returned the orange service light was illuminated.
Few days later this changed to a beeping alarm with BATTERY CHARGING FAULT and STOP light.
The mechanic changed the battery as it was overcharging.
Fault was still there so he changed the alternator.
Fault was still there with the new alternator.


My old alternator got sent for testing and no fault found so it got refitted.


So to date I have paid for a new battery, belt and labour with the mechanic not having a clue what is wrong.


He let me drive it away with the understanding it was a loose connection / wiring fault but now I am not getting any hot air from my fans, so I have not moved my car from before Christmas.
(Driving my girlfriends baby blue fiat 500 - not ideal!)


Someone has told me to change the regulator on the alternator, but had a look online for a mkIII alternator regulator and couldn't find anything. I think the regulator is contained within.


Looking for advice on my next steps please.
Anything short of taking it to the Renault garage for fault finding with a blank cheque would be a brilliant.





Thanks
Craig

Last edited by Doddsyboy99; 1 Week Ago at 11:59 AM.
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post #2 of 9 (permalink) Old 1 Week Ago
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Re: Battery Charging Fault

Does this vehicle have auto Stop Start ?
Where the engine stops & restarts when clutch operated.
So equipped cars need the car to be told it has a new battery using diagnostics.
Similarly diagnostics will be required to identify the cause of the ABS nag.
How good is your Mechanic? Renaults get arsy if the battery is not disconnected in the correct manner.
Try this.....
Bonnet up, drivers window open, Keycard out as if leaving car, shut door, DO NOT LOCK, wait 5 Minutes until computers have gone to sleep.
Ensure you have radio code. Disconnect battery Negative. wait 5, reconnect. No cost check, innit?
Report back.

Regards Tim,
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post #3 of 9 (permalink) Old 1 Week Ago Thread Starter
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Re: Battery Charging Fault

Responses in red.


Quote:
Originally Posted by Nottnoc View Post
Does this vehicle have auto Stop Start ?
No Stop/Start function
Where the engine stops & restarts when clutch operated.
So equipped cars need the car to be told it has a new battery using diagnostics.
Similarly diagnostics will be required to identify the cause of the ABS nag.
How good is your Mechanic?
Runs his own small garage alone, has done for years
Renaults get arsy if the battery is not disconnected in the correct manner.
Try this.....
Bonnet up, drivers window open, Keycard out as if leaving car, shut door, DO NOT LOCK, wait 5 Minutes until computers have gone to sleep.
Ensure you have radio code. Disconnect battery Negative. wait 5, reconnect. No cost check, innit?
Report back.
Can try this tonight. Am I just checking to see if fault is still active?
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post #4 of 9 (permalink) Old 1 Week Ago
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Re: Battery Charging Fault

1) Good
2) Seems this one has stumped him.
3) Worth a quick "reboot" as with all the disturbance, the computers may benefit from a reset.

Once tried, I'll tell you how to reset your windows.

Regards Tim,
You are only young once, but you can be immature forever
Give a n00b the answer he will be learn for a day; show him the search button, he will learn for life.
Currently in Nottnoc's garage:
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post #5 of 9 (permalink) Old 1 Week Ago
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Re: Battery Charging Fault

This still sounds like battery is not charged properly, starting with it being left in a airport car park for a week.

Low battery charge can also trigger an ABS error by itself because battery power is needed to work the ABS pump, not enough 'juice' = no ABS.

A new battery should be given a preliminary charge before installing, despite being 'new'.

Don't know why heater won't now work, suggests mechanic has c0cked something else up during previous work. He doesn't really seem to know what he's doing. But you not driving it around still means it's not getting charged. Any chance of putting a battery charger on it? Then see what it does.

You say belt was changed? If so was water pump also changed, if yes, means needed new coolant, and if not refilled properly air locks may result which could explain why heater doesn't now work, it's no getting any hot water.

Also possible - bad cables / connections between alternator and battery, bad earth cables between body and engine / gearbox.


.

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Last edited by Mike H025; 1 Week Ago at 01:27 PM. Reason: Typos (I'm cracking up!)
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